"Because they can't speak, cats tell us what they are feeling with their body language so it is incumbent upon us humans to know what they are saying to us," Hovav said. "Cats will typically give a number of hints that they are feeling uncomfortable or threatened before they nip. If you see any tail flicking, skin on the back rippling, pupils dilating, ears swiveling, growling, hissing or a paw lifting as if to swat, these are all ways that a cat is telling you, 'Please stop!'"
If your cat gets rough often, never get rough back. Instead, give your cat a break from interacting as soon as you see these signs. Leave the room until your cat calms down. This shows them that you have boundaries.